The invention discloses an atorvastatin calcium tablet and a preparation method thereof. The tablet consists of the following components in parts by mass: 7.22 parts of main medicine atorvastatin calcium, 84.55 parts of filler, 6 parts of disintegrating agent croscarmellose sodium, 1.33 parts of adhesive hydroxy propyl cellulose, 800.4 parts of cosolvent polysorbate and 0.5 part of lubricating agent magnesium stearate, wherein the filler comprises the following raw materials in parts by mass: 22.01 parts of calcium carbonate, 21.87 parts of milk sugar and 40.67 parts of microcrystalline cellulose. The atorvastatin calcium tablet has the characteristics of short disintegrating time, fast dissolving-out speed, high bioavailability and small particle diameter, and is convenient to take. Furthermore, the hardness of the tablet can reach 60-70N, so that the tablet is hardly broken, and therefore, the packing and transporting costs are reduced, and the industrialized popularization of the tablet is easily realized.